M8 at a beat up site

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I posted this last week on detector prospector forum. Another half dime out of a different site. M8 loves small silver. I was in ATLC.
I mostly use the manticore in or around iron with the M8. I’ve really enjoyed using this detector. Every single time I’ve doubted its ability to pull keepers out of a really challenging situation it comes through. What is really weird about the manticore it might hit clean on some targets severely masked in nails then hit another target with an iffy audio that doesn’t seem to have anything around it. Just yesterday afternoon I was getting a weird hit that was all over the place it was smeared from iron to lower 90s, very strange smeared signal that would not lock no matter what I did. This site is literally a constant iron buzz with modern trash everywhere. It was as 1842 half dime I thought for sure I was digging some type of iron mixed with some sort of non ferrous trash. Sensitivity was at 19 which I call a little more than normal. Overdrive for me and my type of sites would have sensitivity at 21. Any more than that the targets are smeared or not detected correctly for my hearing.